<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>


</head>
<body>

请输入注册账号：<input type="text" name="username" id="username" autocomplete="off">
<span id="msg"></span>
<script src="https://cdn.staticfile.net/jquery/1.10.2/jquery.min.js"></script>
<script>
    $(function () {
        $("#username").blur(function () {
            $.ajax({
                type: "POST",
                url: "/checkName",
                data: {
                    "username": $("#username").val()
                },
                success: function (result) {
                    if (result == "true") {
                        $("#msg").html("用户名已经存在").css("color", "red");
                    } else {
                        $("#msg").html("可以使用").css("color", "green")
                    }
                }
            })
        })

    })
</script>


</body>
</html>